Air-valve cap



B. G. HACKETT.

AIR VALVE CAP.

APPLICATION mu) JULY26. I920.

Patented Jan. M), 1922.,

w s we cs: ii a nnn r e. HACKETT, or :Pnovrnnncn, RHQDE lsLAND, Assrenoa on ONE-HALF T .an'rrrun GOOPERMAN, or raovrnnivcn, nnonn ISLAND.

AIR-VALVE GAIP.

Specification of Letters Patent.

Patented Jan. it), 11922.

1 o (/11 10710722 2'15 may concern:

Be it known that I, BERT G. HAoKn'rT, a citizen of the United States, residing at Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful improvements in Air-Valve (laps of which the following is. a specification.

This invention relates to an improvement in air valve caps for use in closing the end of an air-valve casing employed in automobile tubes and other air cushions, and the object of this invention is the provision of such a cap having a closed neck portion and a hollow body portion in which body an elastic packing ring is carried, the same having a central tubular non-yieldin rivet or ferrule for limiting the inward expanslon of the packing ring under pressure to positively prevent this packing from engaglng the valve stem and interfering with the closing of the valve when the cap is screwed into position. v

The nature and advantages of the invention will. be better understood when the following detail description is taken in connection with the accompanying drawings, the invention residing in the combination and arrangement of parts as claimed.

In the drawings forming part of this specification, like numerals of reference indicate similar parts in the several views and wherein Figure 1 is a longitudinal sectional view illustrating my improved cap as applied to an air-valve casing.

Figure 2 is a section of the cap removed.

Figure 3 is an enlarged section of the elastic packing which is carried in the body of the cap.

Figure 4; is a perspective view of the center non-yielding tubular rivet or ferrule.

vFigure 5 is a top view of the packing ring.

It is found in practice that the elastic packing carried by the usual valve cap, when compressed by the positioning of the cap upon its tube or casing often compresses slightly inwardly at its center thereby reducing its central or stem-receiving opening so as to engage the valve stem, pressing it downward and opening the valve slightly causing a slow leak in the tire or air-tube to which the same is attached.

The following is a detail description of one construction of cap by whichthe above difficulties are obviated i lVith reference to the drawings 10 designates the usual valve casing which is ordinarily applied to a pneumatic tire-tubing in which casing is mounted the usual air-valve iii which is provided with an outwardlycxtending stem portion 12.

it is found in practice necessary to provide a cap 13 to be screwed onto the outer end of this casing 10, to cover this valvestem 12 and protect the valve within.

To accomplish this in a simple and eifecfive way without interfering with the action of the valve, l have provided such a cap with a. hollow body portion A having an internally threaded neck portion 15 which is slightly smaller in diameter than that of said body portion thereof thus providing an inner chamber 16.

The outer neck portion 17 of this cap is closed or formed of solid stock so as to prevent the escape of air pressure therethrough. In order to seal this cap when screwed into position on its casing, I have mounted a collar or ring 18 therein of compressible material such as rubber or other suitable elastic material and in the center portion of this ring, I have inserted a hollow or tubular rivet or ferrule having an upper flange 19 on the top of the packing ring and a flange 20 on the lower portion of the packing ring and a hollow center portion 21 through which the stem 12 of the valve may extend.

By this construction it will be seen that when this cap is screwed onto the end of the casing, as illustrated in Figure 1, this packing ring is engaged between the upper shoulder 22 in the hollow body of the cap and the end 23 of the casing, whereby this packing squeezed between these two surfaces causing it to expand outwardly against the walls of the chamber rendering the threaded portion 23 tight against the leakage of air if any should escape through the valve and as the neck portion of the cap is closed the cap is rendered air tight.

By the use of this means, for preventing the elastic ring from expanding inwardly, the full opening or space in the tubular rivet is maintained regardless of the amount of pressure exerted upon the packing ring, and

therefore this packing ring cannot in any way engage the valve stem, to force the valve from its seat by the positioning of the cap.

The device is extremely simple and practical in'construction and by its use the trouble heretofore experienced by slow leaks due to a slight opening of the valve by the positioning of the cap, is effectually prevented.

The foregoing description is directed solely towards the construction illustrated, but ll desire it to be understood that I reserve the privilege of resorting to all the mechanical changes to which the device is susceptible,

' the invention being defined and limited'only by theterms of the appended claims.

I claim:

1.- A cap for a'ii'valve casings having an air-tight outer end portion and a hollow body portion, an elastic packing ring carried in said hollow body, and a non-yielding ring-shaped eyelet having flaring ends and set in the middle of said elastic ring to limit elastic ring to limit its inward expansion under pressure whereby the valve stem may extend through said eyelet without danger of being engaged and pressed from its seat by the positioning of said cap, the periphery of said packing fitting the inner wall of said hollow body whereby when compressed therein the escape of air past it will. 40

be prevented.

In testimony whereof I affix my signature.

BERT G. HACKETT. 

